/// <summary>
/// Reads an ODataFeed or an ODataItem from the reader.
/// </summary>
/// <param name="reader">The OData reader to read from.</param>
/// <returns>The read feed or entry.</returns>
public static ODataItemBase ReadEntryOrFeed(ODataReader reader)
{
if (reader == null)
{
throw Error.ArgumentNull("odataReader");
}
ODataItemBase topLevelItem = null;
Stack<ODataItemBase> itemsStack = new Stack<ODataItemBase>();
while (reader.Read())
{
switch (reader.State)
{
case ODataReaderState.EntryStart:
ODataEntry entry = (ODataEntry)reader.Item;
ODataEntryWithNavigationLinks entryWrapper = null;
if (entry != null)
{
entryWrapper = new ODataEntryWithNavigationLinks(entry);
}
if (itemsStack.Count == 0)
{
Contract.Assert(entry != null, "The top-level entry can never be null.");
topLevelItem = entryWrapper;
}
else
{
ODataItemBase parentItem = itemsStack.Peek();
ODataFeedWithEntries parentFeed = parentItem as ODataFeedWithEntries;
if (parentFeed != null)
{
parentFeed.Entries.Add(entryWrapper);
}
else
{
ODataNavigationLinkWithItems parentNavigationLink = (ODataNavigationLinkWithItems)parentItem;
Contract.Assert(parentNavigationLink.NavigationLink.IsCollection == false, "Only singleton navigation properties can contain entry as their child.");
Contract.Assert(parentNavigationLink.NestedItems.Count == 0, "Each navigation property can contain only one entry as its direct child.");
parentNavigationLink.NestedItems.Add(entryWrapper);
}
}
itemsStack.Push(entryWrapper);
break;
case ODataReaderState.EntryEnd:
Contract.Assert(itemsStack.Count > 0 && (reader.Item == null || itemsStack.Peek().Item == reader.Item), "The entry which is ending should be on the top of the items stack.");
itemsStack.Pop();
break;
case ODataReaderState.NavigationLinkStart:
ODataNavigationLink navigationLink = (ODataNavigationLink)reader.Item;
Contract.Assert(navigationLink != null, "Navigation link should never be null.");
ODataNavigationLinkWithItems navigationLinkWrapper = new ODataNavigationLinkWithItems(navigationLink);
Contract.Assert(itemsStack.Count > 0, "Navigation link can't appear as top-level item.");
{
ODataEntryWithNavigationLinks parentEntry = (ODataEntryWithNavigationLinks)itemsStack.Peek();
parentEntry.NavigationLinks.Add(navigationLinkWrapper);
}
itemsStack.Push(navigationLinkWrapper);
break;
case ODataReaderState.NavigationLinkEnd:
Contract.Assert(itemsStack.Count > 0 && itemsStack.Peek().Item == reader.Item, "The navigation link which is ending should be on the top of the items stack.");
itemsStack.Pop();
break;
case ODataReaderState.FeedStart:
ODataFeed feed = (ODataFeed)reader.Item;
Contract.Assert(feed != null, "Feed should never be null.");
ODataFeedWithEntries feedWrapper = new ODataFeedWithEntries(feed);
if (itemsStack.Count > 0)
{
ODataNavigationLinkWithItems parentNavigationLink = (ODataNavigationLinkWithItems)itemsStack.Peek();
Contract.Assert(parentNavigationLink != null, "this has to be an inner feed. inner feeds always have a navigation link.");
Contract.Assert(parentNavigationLink.NavigationLink.IsCollection == true, "Only collection navigation properties can contain feed as their child.");
parentNavigationLink.NestedItems.Add(feedWrapper);
}
else
{
topLevelItem = feedWrapper;
}
itemsStack.Push(feedWrapper);
break;
case ODataReaderState.FeedEnd:
Contract.Assert(itemsStack.Count > 0 && itemsStack.Peek().Item == reader.Item, "The feed which is ending should be on the top of the items stack.");
itemsStack.Pop();
break;
case ODataReaderState.EntityReferenceLink:
ODataEntityReferenceLink entityReferenceLink = (ODataEntityReferenceLink)reader.Item;
Contract.Assert(entityReferenceLink != null, "Entity reference link should never be null.");
ODataEntityReferenceLinkBase entityReferenceLinkWrapper = new ODataEntityReferenceLinkBase(entityReferenceLink);
Contract.Assert(itemsStack.Count > 0, "Entity reference link should never be reported as top-level item.");
{
ODataNavigationLinkWithItems parentNavigationLink = (ODataNavigationLinkWithItems)itemsStack.Peek();
parentNavigationLink.NestedItems.Add(entityReferenceLinkWrapper);
}
break;
default:
Contract.Assert(false, "We should never get here, it means the ODataReader reported a wrong state.");
break;
}
}
Contract.Assert(reader.State == ODataReaderState.Completed, "We should have consumed all of the input by now.");
Contract.Assert(topLevelItem != null, "A top level entry or feed should have been read by now.");
return topLevelItem;
}
private ODataResponse ReadResponse(ODataReader odataReader)
{
ResponseNode rootNode = null;
var nodeStack = new Stack<ResponseNode>();
while (odataReader.Read())
{
if (odataReader.State == ODataReaderState.Completed)
break;
switch (odataReader.State)
{
case ODataReaderState.FeedStart:
StartFeed(nodeStack, CreateFeedDetails(odataReader.Item as ODataFeed));
break;
case ODataReaderState.FeedEnd:
EndFeed(nodeStack, CreateFeedDetails(odataReader.Item as ODataFeed), ref rootNode);
break;
case ODataReaderState.EntryStart:
StartEntry(nodeStack);
break;
case ODataReaderState.EntryEnd:
EndEntry(nodeStack, ref rootNode, odataReader.Item);
break;
case ODataReaderState.NavigationLinkStart:
StartNavigationLink(nodeStack, (odataReader.Item as ODataNavigationLink).Name);
break;
case ODataReaderState.NavigationLinkEnd:
EndNavigationLink(nodeStack);
break;
}
}
return ODataResponse.FromNode(rootNode);
}
public ODataReaderEntityMaterializer(ODataMessageReader odataMessageReader, ODataReader reader, ResponseInfo responseInfo, QueryComponents queryComponents, Type expectedType, ProjectionPlan materializeEntryPlan) : base(responseInfo, queryComponents, expectedType, materializeEntryPlan)
{
this.messageReader = odataMessageReader;
this.itemReader = new ODataFeedOrEntryReader(reader, responseInfo);
}
public ODataFeedOrEntryReader(ODataReader reader, ResponseInfo responseInfo)
{
this.reader = reader;
this.responseInfo = responseInfo;
this.currentEntry = null;
this.currentFeed = null;
this.feedEntries = null;
}
private void ReadAndOutputEntryOrFeed(ODataReader reader)
{
while (reader.Read())
{
switch (reader.State)
{
case ODataReaderState.FeedStart:
{
ODataFeed feed = (ODataFeed)reader.Item;
this.writer.WriteLine("ODataFeed:");
this.writer.Indent++;
}
break;
case ODataReaderState.FeedEnd:
{
ODataFeed feed = (ODataFeed)reader.Item;
if (feed.Count != null)
{
this.writer.WriteLine("Count: " + feed.Count.ToString());
}
if (feed.NextPageLink != null)
{
this.writer.WriteLine("NextPageLink: " + feed.NextPageLink.AbsoluteUri);
}
this.writer.Indent--;
}
break;
case ODataReaderState.EntryStart:
{
ODataEntry entry = (ODataEntry)reader.Item;
this.writer.WriteLine("ODataEntry:");
this.writer.Indent++;
}
break;
case ODataReaderState.EntryEnd:
{
ODataEntry entry = (ODataEntry)reader.Item;
this.writer.WriteLine("TypeName: " + (entry.TypeName ?? "<null>"));
this.writer.WriteLine("Id: " + (entry.Id ?? "<null>"));
if (entry.ReadLink != null)
{
this.writer.WriteLine("ReadLink: " + entry.ReadLink.AbsoluteUri);
}
if (entry.EditLink != null)
{
this.writer.WriteLine("EditLink: " + entry.EditLink.AbsoluteUri);
}
if (entry.MediaResource != null)
{
this.writer.Write("MediaResource: ");
this.WriteValue(entry.MediaResource);
}
this.WriteProperties(entry.Properties);
this.writer.Indent--;
}
break;
case ODataReaderState.NavigationLinkStart:
{
ODataNavigationLink navigationLink = (ODataNavigationLink)reader.Item;
this.writer.WriteLine(navigationLink.Name + ": ODataNavigationLink: ");
this.writer.Indent++;
}
break;
case ODataReaderState.NavigationLinkEnd:
{
ODataNavigationLink navigationLink = (ODataNavigationLink)reader.Item;
this.writer.WriteLine("Url: " + (navigationLink.Url == null ? "<null>" : navigationLink.Url.AbsoluteUri));
this.writer.Indent--;
}
break;
}
}
}
private ODataResponse ReadResponse(ODataReader odataReader, bool includeResourceTypeInEntryProperties)
{
ResponseNode rootNode = null;
var nodeStack = new Stack<ResponseNode>();
while (odataReader.Read())
{
if (odataReader.State == ODataReaderState.Completed)
break;
switch (odataReader.State)
{
case ODataReaderState.FeedStart:
StartFeed(nodeStack, CreateFeedDetails(odataReader.Item as ODataFeed));
break;
case ODataReaderState.FeedEnd:
EndFeed(nodeStack, CreateFeedDetails(odataReader.Item as ODataFeed), ref rootNode);
break;
case ODataReaderState.EntryStart:
StartEntry(nodeStack);
break;
case ODataReaderState.EntryEnd:
EndEntry(nodeStack, ref rootNode, odataReader.Item, includeResourceTypeInEntryProperties);
break;
case ODataReaderState.NavigationLinkStart:
StartNavigationLink(nodeStack, (odataReader.Item as ODataNavigationLink).Name);
break;
case ODataReaderState.NavigationLinkEnd:
EndNavigationLink(nodeStack);
break;
}
}
return rootNode.Feed != null
? ODataResponse.FromFeed(rootNode.Feed, rootNode.FeedAnnotations)
: ODataResponse.FromEntry(rootNode.Entry);
}
